Means for cooling the valve stems and seats in internal-combustion engines



- 4 G. c. CAPPA MEANS FOR COOLING THE VALVE STEMS' AND SEATS IN INTERNAL COMBUSTION ENGINES March 22 Filed Feb. 13, 1925 Patented Mar. 22, 1927.

UNlTED STATES PATENT OFFICE.

GrULIo cnsaan CAPPA, or TUBIN, ITALY.

alarms ron'coomim 'rnn ALVE STEMS AND sears m m'rnanancomnvsrrron ENGINES.

Application filed February 18, 1925, Serial Roi-8.905, and in Italy february 23, 1924.

This invention relates to a cooling arcient cooling of the parts directly subjected rangement for the engine valves, 'w ereln a number of nozzles are disposed in corrc-.

spondence with the valve seats and turned the stem boxes,

'sentlinto the hollow between the two con- This device ensures an. efiicient and complete cooling of the members to which it is applied, also'because the active stream of liquid removes the steam bubbles, as soon as they may have formed, thus preventing superheating of the parts,

The accompanying drawing shows diagrammatically a d by way of example the invention in co ectiontwith anexplosion engine cylinder with double valves.

Figure l isan axial, vertical section on line A-B of Fig. 2.

I Fi

of Fig, 1. I

1 denotes the cylinder bore, with a water jacket 2, which surrounds also: the seats 3 and the pipes. 4 ofthesuction and outletvalves. These pipes differ from the normal construction in that'they have a. large heat exchanging surface 5 forming 'recessessurrounding the valve guides Q and communieating directly with the water jacket. In

correspondence to these recesses are provid ed nozzles 7 fed through, across tube 8 served directly by? the pump through a conduit-g9, y

Between each valvecouple is arranged an: other nozzle. 7 from which the water jet is tiguous pipes I These water jets besldes producing an efli towards these latter, so as to send a waterre 2 is a horizontal section on line -zles in said extension for dischargin ter onto .the, valve;

thereto, actlvely stirthe water surrounding 40 the valve-guides. thus improving the heat exchange,- preventing the formation of steam bubbles -or immediately, removing, those that might have formed The water diccharge from, the nozzles circulates-around the boxes 6, in the recessesfi and out of the latter into the jacket 2 and around the cyl inder. I

If convenient further nozzles can be provided in other parts for cooling purposes and their shapeand arrangement can be varied from the above described without departingfromthe spirit of the'inventionv- What I claim is: v The" combination of a cylinder for internal combustionengines, having guides for the stems of the inlet and exhaust valves of the'engine, inlet and exhaust pipes having large heat exchanging surfaces forming re cesses surrounding and extending between the valve guides, a cooling jacket surroundpipes extending longitudinally of the cy der between the wall of the latter and the jacket,'an extension of the supply pipe extending horizontally through the jacket across the top ofthe cylinder head, and nozwa-. 7 v ides and. into t e recesses and. water. jac et through the top of the latter. F

In testimony whereof I have afiixed my signature. t v GIULIQ. CE-SARE GAPPA. 

